Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 7 The Structure of Atoms and Periodic Trends - Study Questions: 37

Answer

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Work Step by Step

a) Cr (group 6, period 4): $[Ar]\ 3d^5\ 4s^1$ Removing three electrons: $Cr^{3+}$: $[Ar]\ 3d^3$ b) Both are paramagnetic since they have unpaired electrons, but $Cr^{2+}$ has 4 unpaired, thus being more paramagnetic. c) Since radius increases from top to bottom on the periodic table, the radius of $Al^{3+}$ should be smaller than 64 pm since Al is in the third period.
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